OSI Layer-Based Security: The complete series, Layers 1–10, as originally published on DEV, November 2025 – February 2026

This collection preserves the OSI Layer-Based Security series originally published on DEV between late 2025 and early 2026. The articles developed iteratively rather than in numerical OSI order and are reproduced substantially as originally published. Layers 1–7 use the canonical OSI model as their technical point of departure. Layers 8–10 are explicitly noncanonical analytical extensions exploring human, organizational, governance, economic, and ecosystem dimensions of security. The collection should be read as exploratory security architecture and analysis rather than as a standards document or implementation guide. Configuration examples reflect the articles as originally published and have not been comprehensively revalidated for this archival edition. Terminology note: “The Steward” appears in both the Layer 4 strategic companion and Layer 5. An earlier Layer 4 reference to Layer 3 as “the Router” predates the final Layer 3 archetype, “The Navigator.” These terms are preserved to reflect the series' development. Technical erratum: The Layer 3 RPKI configuration example containing bgp bestpath prefix-validate allow-invalid should not be read as an example of rejecting RPKI-invalid routes. The original text is preserved for archival integrity.